What are the responsibilities of the transport layer in the internet model?

Answer 1

The data link layer is responsible for

a. framing data bits

b. providing the physical addresses of the sender/receiver

c. data rate control

d. detection and correction of damaged and lost frames

Answer 2

1. Keeping track of the individual conversations taking place between applications on the source and destinations on the source and destination hosts.

2. Segmenting data and adding a header to identify and manage each segment.

3. Using the header information to reassemble the segments into applications data.

4. Passing the assembled data to the correct applications.

Answer 3

If networking software performs reliable data transfer functions, then the detection of errors, and retransmission of data to recover those errors or lost data will occur in software managing this layer. Thetransport layer may use a variety of techniques such as a Cyclic Redundancy Check, windowing and acknowledgements. If data is lost or damaged it is the transport layer's responsibility to recover from that error.

1. Communicate with the Sessionlayer above.
2. Reassemble transport Protocol Data Units into data streams
3. Reliableprotocols operating at this layer will
   • Detect errors and lost data
   • Recover lost data
   • Manage retransmission of data.
4. Segmentation of data streams into transportProtocol Data Units.
5. Communicate with the Networklayer below.

Examples of transport layer protocols include:

• Transmission Control Protocol (Reliable)
• User Datagram Protocol (Unreliable)

Answer 4

Transport layer is responsible for creating and closing of virtual circuits, establishing reliable connections (for TCP) and so on.